Golf Club Heads With Loft-based Weights and Methods to Manufacture Golf Club Heads

ABSTRACT

Embodiments of golf club heads with loft-based weights and methods to manufacture golf club heads are generally described herein. Other embodiments may be described and claimed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 12/178,795, filed Jul. 24, 2008.

TECHNICAL FIELD

The present disclosure relates generally to golf equipment, and moreparticularly, to golf club heads with loft-based weights and methods tomanufacture golf club heads.

BACKGROUND

Typically during a golf shot, energy may be transferred from the clubhead of a golf club to the golf ball. Several factors including initialvelocity, backspin rate, and launch angle may affect the flight of thegolf ball (i.e., ball flight). In addition to club head speed, club headshape and structure may affect the initial velocity, the spin rate,and/or the launch angle of the golf ball. The initial velocity of thegolf ball may be a function of the club head speed at impact between theclub head and the golf ball. With all other factors held constant, ahigher initial ball velocity may result in the golf ball travelingfarther.

The physical geometry and structure of the club head may define a loftangle (e.g., club loft). In particular, the loft angle may be an anglebetween a front end plane and a loft plane (e.g., a plane parallel tothe club face). When the club head impacts the golf ball, spin may beimparted on the golf ball. Ball flight and flight distance of the golfball may vary based on the spin imparted by the club head. For example,a club head with a relatively higher loft angle may impart a relativelyhigher ball flight but may provide a relatively shorter flight distance.In contrast, a club head with a relatively lower loft angle may providea relatively farther flight distance but impart a relatively lower ballflight. Thus, a set of golf clubs may include a progression of loftangles to provide an individual with a range of ball flights and flightdistances.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top perspective view of an example golf club head accordingto an embodiment of the apparatus, methods, and articles of manufacturedescribed herein.

FIG. 2 depicts a heel end view of the example golf club head of FIG. 1.

FIG. 3 depicts a top view of an example golf club head.

FIG. 4 depicts a top view of another example golf club head.

FIG. 5 depicts a heel end view of the example golf club head of FIG. 3.

FIG. 6 depicts a heel end view of the example golf club head of FIG. 4.

FIG. 7 depicts a cross-sectional view of the example golf club head ofFIG. 3 along the line 7-7.

FIG. 8 depicts a cross-sectional view of the example golf club head ofFIG. 4 along the line 8-8.

FIG. 9 depicts a cross-sectional view of the example golf club head ofFIG. 5 along the line 9-9.

FIG. 10 depicts a cross-sectional view of the example golf club head ofFIG. 6 along the line 10-10.

FIG. 11 depicts an example graph of weight position versus loft angle.

FIG. 12 depicts another example graph of weight position versus loftangle.

FIG. 13 depicts an example graph of ball height versus carry distance.

FIG. 14 is a flow diagram of one manner in which an example golf clubmay be manufactured.

DESCRIPTION

In general, apparatus, methods, and articles of manufacture associatedwith golf club heads with loft-based weights are described herein. Themethods, apparatus, and articles of manufacture described herein are notlimited in this regard.

FIGS. 1 and 2 depict an example golf club head 100 that may include atoe end 130, a heel end 132, a front end 134, a back end 136, a faceportion 140, a top wall portion 142 (e.g., a crown), and a bottom wallportion 144 (e.g., a sole). The golf club head 100 may be made of one ormore metal materials such as titanium, titanium alloy, and/or any othersuitable materials.

The toe end 130 may be opposite of the heel end 132, and the front end134 may be opposite of the back end 136. The face portion 140 may belocated in the front end 134 and configured to impact a golf ball (notshown). In particular, the face portion 140 may include a plurality ofgrooves 150. The plurality of grooves 150 may be elongated in adirection between the toe end 130 and the heel end 132 on the faceportion 140. The top wall portion 142 may be opposite of the bottom wallportion 144.

The golf club head 100 may also include a hosel 160 and a hoseltransition 165. For example, the hosel 160 may be located at orproximate to the heel end 132. The hosel 160 may extend from the clubhead 100 via the hosel transition 165. To form a golf club, the hosel160 may receive a first end of a shaft 198. The shaft 198 may be securedto the golf club head 100 by an adhesive bonding process (e.g., epoxy)and/or other suitable bonding processes (e.g., mechanical bonding,soldering, welding, and/or brazing). Further, a grip 199 may be securedto a second end of the shaft 198 to complete the golf club.

While the above examples describe various portions and/or surfaces ofthe golf club head 100, the golf club head 100 may not include certainportions and/or surfaces. For example, although one or more figures maydepict the top wall portion 142 transitioning directly to the bottomwall portion 144, the golf club head 100 may include a separate sidewall portion (e.g., a skirt). In particular, the side wall portion maybe located between the top wall portion 142 and the bottom wall portion144, and wrap around the back end 136 of the golf club head 100 from thetoe end 130 to the heel end 132. Further, while one or more of figuresmay depict the hosel 160 and the hosel transition 165, the golf clubhead 100 may not include the hosel 160 and/or the hosel transition 165.In one example, the club head 100 may include a bore (not shown) withinthe golf club head 100 to receive a shaft (e.g., an opening of the boremay be relatively flushed with the top wall portion 142).

Referring to FIG. 2, for example, the golf club head 100 may beassociated with a front end plane 210, a ground plane 220, and a loftplane 230. The front end plane 210 may be perpendicular to the groundplane 220. The ground plane 220 may be substantially parallel to thebottom wall portion 144 of the golf club head 100. The loft plane 230may be substantially parallel to the face portion 140 of the golf clubhead 100 and may intersect with the ground plane 220 at the intersectionline 235. The front end plane 210 and the loft plane 230 may form a loftangle 250 (θ).

As noted above, spin may be imparted on a golf ball (not shown) when thegolf club head 100 impacts the golf ball. Ball flight and flightdistance of the golf ball may vary based on the spin imparted by thegolf club head 100. For example, a golf club head with a relativelyhigher loft angle may impart a relatively higher ball flight but mayprovide a relatively shorter flight distance. In contrast, a golf clubhead with a relatively lower loft angle may provide a relatively fartherflight distance but impart a relatively lower ball flight. Thus, a setof golf clubs may include a progression of loft angles to provide anindividual with a range of ball flights and flight distances. Instead ofmanufacturing a weight at an identical position in golf club heads withvarious loft angles, an internal and/or external weight (not shown) maybe positioned based on the loft angle 250 as described in detail below.The methods, apparatus, and articles of manufacture described herein arenot limited this regard.

In the examples of FIGS. 3-10, each of a first golf club head 300 (e.g.,shown in FIGS. 3, 5, 7, and 9) and a second golf club head 400 (e.g.,shown in FIGS. 4, 6, 8, and 10) may include a weight, generally shown asa first weight (e.g., 710 of FIG. 7) and a second weight (e.g., 810 ofFIG. 8), respectively. As described in detail below, each of the firstweight 710 (FIG. 7) and the second weight 810 (FIG. 8) may be associatedwith a particular weight position based on a loft angle. Although thefirst and second weights 710 and 810 may be depicted as internal weights(e.g., within the first and second golf club heads 300 and 400respectively), the first and second weights 710 and 810 may be externalweights. Alternatively, the first and second weights 710 and 810 mayinclude an internal portion and an external portion relative to thefirst and second golf club heads 300 and 400, respectively.

As illustrated in FIGS. 3, 5, 7, and/or 9, the first golf club head 300may include a first toe end 330, a first heel end 332, a first front end334, a first back end 336, a first face portion 340, a first top wallportion 342, and a first bottom wall portion 344. For example, the firstgolf club head 300 may be associated with a first front end plane 510, afirst ground plane 520, and a first loft plane 530. Similar to the frontend plane 210 and the ground plane 220 as described above and shown inFIG. 2, the first front end plane 510 may be perpendicular to the firstground plane 520. The first ground plane 520 may be substantiallyparallel to the first bottom wall portion 344 of the first golf clubhead 300. The first front end plane 510 and the first ground plane 520may be perpendicular to each other and intersect at a first intersectionline 535. The first loft plane 530 may be substantially parallel to thefirst face portion 340 of the first golf club head 300. The first loftplane 530 may also intersect with the first ground plane 520 at thefirst intersection line 535. The first front end plane 510 and the firstloft plane 530 may form a first loft angle 550 (θ₁).

The first front end plane 510 may intersect a first axis 380 (FIGS. 3and 7) extending from the first front end 334 to the first back end 336of the first club head 300. In one example, the first axis 380 may becentered relative to the first face portion 340 of the first club head300. In another example, the first axis 380 may be positioned toward thefirst heel end 332 or the first toe end 330 of the first golf club head300. In addition or alternatively, the first axis 380 may be positiontoward the first top wall portion 342 or the first bottom wall portion344.

In a similar manner as depicted in FIGS. 4, 6, 8, and/or 10, a secondgolf club head 400 may include a second toe end 430, a second heel end432, a second front end 434, a second back end 436, a second faceportion 440, a second top wall portion 442, and a second bottom wallportion 444. For example, the second golf club head 400 may beassociated with a second front end plane 610, a second ground plane 620,and a second loft plane 630. Similar to the first front end plane 510and the first ground plane 520 as described above (FIG. 5), the secondfront end plane 610 and the second ground plane 620 may be perpendicularto each other and intersect at a second intersection line 635. Thesecond ground plane 620 may be substantially parallel to the secondbottom wall portion 644 of the second golf club head 400. The secondloft plane 630 may be substantially parallel to the second face portion640 of the second golf club head 400. The second loft plane 630 may alsointersect with the second ground plane 620 at the second intersectionline 635. The second front end plane 610 and the second loft plane 630may form a second loft angle 650 (θ₂).

The second front end plane 610 may intersect a second axis 480 (FIGS. 4and 8) extending from the second front end 434 to the second back end436 of the second club head 400. In one example, the second axis 480 maybe centered relative to the second face portion 440 of the second clubhead 400. In another example, the second axis 480 may be positionedtoward the second heel end 432 or the second toe end 430 of the secondgolf club head 400. In addition or alternatively, the second axis 480may be positioned toward the second top wall portion 442 or the secondbottom wall portion 444.

As noted above, the first golf club head 300 may include a first weight710 (FIGS. 7 and 9) and the second golf club head 400 may include asecond weight 810 (FIGS. 8 and 10). In particular, the first weight 710may be associated with a first weight position 720 whereas the secondweight 810 may be associated with a second weight position 820. Thefirst weight position 720 may be located at or proximate to a distancealong the first axis 380 between the first loft plane 530 and the firstback end 336. The second weight position 820 may be located at orproximate to a distance along the second axis 480 between the secondloft plane 630 and the second back end 436. In one example, the firstweight position 720 may correspond to a location of a center of mass ofthe first weight 710, and the second weight position 820 may correspondto a location of a center of mass of the second weight 810.Alternatively, the first weight position 720 may be correspond to alocation of an edge of the first weight 710, and the second weightposition 820 may correspond to an edge of the second weight 810 (e.g., afront edge or a back edge of the weight).

The first weight position 720 may be defined by the first loft angle 550whereas the second weight position 820 may be defined by the second loftangle 650. Further, the first weight position 720 may be located at orproximate to a first distance 722 (X₁) from the first front end plane510 whereas the second weight position 820 may be located at orproximate to a second distance 822 (X₂) from the second front end plane610. In general, the second loft angle 650 is greater than the firstloft angle 550 (θ₂>θ₁). However, the second weight position 820 may belocated relatively closer to the second front end plane 610 than thefirst weight position 720 relative to the first front end plane 510(X₁>X₂). Accordingly, as the loft angle increases, the distance of theweight position relative to the front end plane may decrease (e.g., theweight may be positioned closer to the front end plane). Therefore, thedistance of the weight position relative to the front end plane may beinversely proportional to the loft angle of a golf club head.

Although the figures may depict the first and second weights 710 and 810having elliptical shapes, the first and/or second weights 710 and 810may have circular shapes, polygonal shapes, free-formed shapes (e.g.,figure-eight shapes, kidney shapes, etc.), or any other suitable shapes.While the first and second weights 710 and 810 may be depicted as havingthe same shape, the first and second weights 710 and 810 may havedifferent shapes. In one example, each of the first and second weights710 and 810 may be at least 48 grams. Also, the first and second weights710 and 810 may be approximately 2.3 inches in length, 1.5 inches inwidth, and 0.3 inches in height. The first and/or second weights 710 and810 may be a single weight or a plurality of weights with otherdimensions. The first and/or second weights 710 and 810 may includemetal material such as steel, titanium, titanium alloy, tungsten, and/orany other suitable materials. While the above examples may depictweights of particular size, shape, and/or material, the apparatus,methods, and articles of manufacture described herein may includeweights configured in various sizes, shapes, and/or materials. Themethods, apparatus, and articles of manufacture described herein are notlimited in this regard.

In general, the weight position (e.g., the first weight position 720 ofFIG. 7 or the second weight position 820 of FIG. 8) may be based on theloft angle of a golf club head. The distance between the weight positionand the front end plane may be a function of the loft angle in either alinear manner (e.g., FIG. 11) or a non-linear manner (e.g., FIG. 12). Inthe example of FIG. 11, a linear relationship 1100 between the weightposition and the loft angle may be defined by the equation ofx=(−0.086*θ)+3.297, where x represents the distance between the weightposition and the front end plane in units of inches (in), and θrepresents the loft angle in units of degrees (°) (e.g., shown as line1110). As the loft angle increases, the distance between the weightposition and the front end plane decreases. For example, the equationmay indicate that the weight may be positioned at or about two (2)inches from the front end plane for a golf club head with a 15-degreeloft angle whereas the weight may be positioned at or aboutone-and-a-half (1.5) inches from the front end plane for a golf clubhead with a 20-degree loft angle. Further, a suitable range of weightpositions for a golf club head with a 15-degree loft angle may extendbetween 1.5 inches (1114) to 2.5 inches (1116). Alternatively, therelationship between the weight position and the loft angle may bedefined by a range. As shown in dashed lines, for example, a range ofsuitable weight positions 1150 may be defined by a lower boundary 1154and an upper boundary 1156. The range of suitable weight positions 1150may be defined by the equation (−0.086* θ)+3.797≧x≧(−0.086*θ)+2.797.Although FIG. 11 may depict an example equation with a particular rangeof loft angles, the methods, apparatus, and articles of manufacturedescribed herein are not limited in this regard.

Alternatively, as noted above, the weight position may be inverselyproportional to the loft angle in a non-linear manner. Referring to FIG.12, for example, a non-linear relationship 1200 between the weightposition and the loft angle may be defined by the equation ofx=(−0.009*θ̂2)+(0.194*θ)+1.192, where x represents the weight position inunits of inches (in), and θ represents the loft angle in units ofdegrees (°) (e.g., shown as line 1210). As the loft angle increases, thedistance between the weight position and the front end plane decreases.While FIG. 12 may depict an example equation with a particular range ofloft angles, the methods, apparatus, and articles of manufacturedescribed herein are not limited in this regard.

Turning to FIG. 13, for example, each golf shot from a golf club headmay be associated with a ball flight trajectory 1300, generally shown asa first trajectory 1310, a second trajectory 1320, and a thirdtrajectory 1330. For the examples described below, the club head speedand the loft angle associated with the all flight trajectories 1300 maybe constant. In particular, the ball flight trajectories 1300 mayrepresent the effect of weight position of a golf club head on heightand carry distance of a golf ball. The ball flight trajectories 1300 mayvary based on the movement of a weight along an axis that may beperpendicular to the front end plane (e.g., the axis 380 of FIG. 3 orthe axis 480 of FIG. 4).

In one example, the second trajectory 1320 may represent a weightposition to provide optimal spin and carry distance. In contrast, aweight position associated with the first trajectory 1310 may be fartherfrom a front end plane than a weight position associated with the secondtrajectory 1320. As a result, the weight position associated with thefirst trajectory 1310 may generate relatively more spin resulting inrelatively higher ball flight and less carry distance. In anotherexample, a weight position associated with the third trajectory 1330 maybe closer to a front end plane than a weight position associated withthe second trajectory 1320. Thus, a weight position associated with thethird trajectory 1330 may be generate relatively less spin resulting inrelatively lower ball flight and less carry distance. The methods,apparatus, and articles of manufacture described herein are not limitedin this regard.

As a result, a golf club head with a relatively lower loft angle and aweight positioned relatively farther from a front end plane may increasethe amount of spin imparted on a golf ball to increase ball flight ofthe golf ball. A golf club head with a relatively higher loft angle anda weight position relatively closer to the front end plane may reducethe amount of spin imparted on a golf ball to increase the flightdistance traveled by the golf ball. Further, the golf club head with therelatively higher loft angle and the weight position relatively closerto the front end plane may rotate relatively less than the golf clubhead with the relatively lower loft angle and the weight positionedrelatively farther from the front end plane. With relatively lessrotation at impact with the golf ball, the amount of vibration may bereduced to provide a better feel. The methods, apparatus, and articlesof manufacture described herein are not limited in this regard.

Although the above examples describe various portions and/or surfaces ofthe golf club head 100, the golf club head 100 may not include certainportions and/or surfaces. For example, while FIG. 1 may depict the topwall portion 142, the bottom wall portion 144, and the side wall 146 asseparate surfaces, the side wall 146 may merge with either the top wallportion 142 or the bottom wall portion 144 into a single surface of thehollow body 110 (e.g., the body 110 may include the top wall portion 142and the bottom wall portion 144 but not the side wall 146). In oneexample, the bottom wall portion 144 and the side wall 146 may mergeinto a single bottom surface of the body 110. Further, although FIG. 1may depict the hosel 160 and the hosel transition 165, the golf clubhead 100 may not include the hosel 160 and/or the hosel transition 165.In one example, the golf club head 100 may include a bore (not shown)within the body 110 to receive the shaft 198 (e.g., an opening of thebore may be flushed with the top wall portion 142).

While some of the above figures may depict a utility club head or ametal wood-type club head (e.g., drivers, fairway woods, etc.), themethods, apparatus, and articles of manufacture described herein may bereadily applicable to other suitable types of golf club heads. Forexample, the methods, apparatus, and articles of manufacture describedherein may be applicable to hybrid-type club heads, iron-type clubheads, or other suitable types of golf club heads. The methods,apparatus, and articles of manufacture described herein are not limitedthis regard.

In the example of FIG. 14, a process 1400 may begin with casting theclub head 100 (FIG. 1) to form a golf club (block 1410). As noted above,the club head 100 may include the face portion 140, which may define aloft angle. The process 1400 may include positioning a weight (e.g., theweight 518 of FIG. 5) at a distance relative to a front end plane basedon the loft angle (e.g., the first loft angle 510 of FIG. 5) in either alinear manner or a non-linear manner as described above (block 1420).Further, the process 1400 may include securing a shaft (e.g., the shaft198 of FIG. 1) to the club head 100 as described above (block 1430).Further, the process 1400 may include securing a grip (e.g., the grip199 of FIG. 1) to the shaft 198 (block 1440).

Although the process 1400 may be described above with respect to thegolf club head 100, the process 1400 may be applicable to other golfclub heads. Further, while a particular order of actions is illustratedin FIG. 14, these actions may be performed in other temporal sequences.For example, two or more actions depicted in FIG. 14 may be performedsequentially, concurrently, or simultaneously.

Although certain example methods, apparatus, and/or articles ofmanufacture have been described herein, the scope of coverage of thisdisclosure is not limited thereto. On the contrary, this disclosurecovers all methods, apparatus, and/or articles of manufacture fairlyfalling within the scope of the appended claims either literally orunder the doctrine of equivalents.

1. A set of golf clubs comprising: at least two golf clubs, each club ofthe at least two golf clubs comprising: a grip; a shaft having a firstend and a second end, the shaft coupled to the grip at the first end;and a club head having a toe end, a heel end, a front end, a back end, atop wall portion, a bottom wall portion, and a face portion associatedwith a loft angle, the loft angle defined by a loft plane and a frontend plane perpendicular to a ground plane, the loft plane substantiallyparallel to the face portion, the front end plane located at afront-most part of the face portion; and a first weight positioned at orproximate to a first distance between the front end plane, at least aportion of the first weight positioned along an axis extending betweenthe front end and the back end, wherein: the first distance of each clubof the at least two golf clubs is defined by an equation of((−0.086*θ)+3.797)≧x≧((−0.086*θ)+2.797), where the first distance, x,has units of inches and the loft angle, θ, has units of degrees.
 2. Theset of golf clubs of claim 1, wherein: the first distance of each clubof the at least two golf clubs comprises one of: a second distance beinginversely proportional to the loft angle in a linear manner; or a thirddistance being inversely proportional to the loft angle in a non-linearmanner.
 3. The set of golf clubs of claim 1, wherein: a center of massof the first weight is positioned at or proximate to the first distance.4. The set of golf clubs of claim 1, wherein: the first weight comprisesat least one of: a second weight integrated into the body or a firstadjustable weight.
 5. The set of golf clubs of claim 1, wherein: thefirst distance of the first weight of each club head of the two or moregolf club heads is inversely proportional to the loft angle.
 6. A set ofgolf clubs comprising: two or more golf club heads, wherein: each clubhead of the two or more golf club heads comprises: a body having a frontface and a first weight; the first weight of each club head of the twoor more golf club heads is positioned at a first distance relative to afront end plane, the front end plane is located at the front face and isperpendicular to a ground plane; the front face of each club head of thetwo or more golf club heads has a loft angle, the loft angle is an anglebetween the front face and the front end plane; and the first distanceof the first weight of each club head of the two or more golf club headsis inversely proportional to the loft angle of the front face of eachclub head of the two or more golf club heads.
 7. The set of golf clubsof claim 6, wherein: the first distance of the first weight of each clubhead of the two or more golf club heads is inversely proportional to theloft angle of each club head of the two or more golf club heads in alinear manner.
 8. The set of golf clubs of claim 6, wherein: the firstdistance of the first weight of each club head of the two or more golfclub heads is inversely proportional to the loft angle of each club headof the two or more golf club heads in a non-linear manner.
 9. The set ofgolf clubs of claim 6, wherein: the first distance, x, is defined by anequation of ((−0.086*θ)+3.797)≧x≧((−0.086*θ)+2.797), where the firstdistance, x, has units of inches and the loft angle, θ, has units ofdegrees.
 10. The set of golf clubs of claim 6, wherein: the firstdistance, x, is defined by an equation of x=(−0.086*θ)+3.297, where thefirst distance, x, has units of inches and the loft angle, 0, has unitsof degrees.
 11. The set of golf clubs of claim 6, wherein: the firstdistance, x, is defined by an equation of x=(−0.009*θ̂2)+(0.194*θ)+1.192,where the first distance, x, has units of inches and the loft angle, θ,has units of degrees.
 12. The set of golf clubs of claim 6, wherein acenter of mass of the first weight in each club head of the two or moregolf club heads is positioned at the first distance.
 13. The set of golfclubs of claim 6, wherein: an edge of the first weight in each club headof the two or more golf club heads is positioned at the first distance.14. A set of golf clubs comprising: a first club having a first clubhead, the first club head comprising: a first toe end, a first heel end,a first front end, a first back end, a first top wall portion, a firstbottom wall portion, a first face portion associated with a first loftangle defined by a first loft plane and a first front end plane, thefirst front end plane is perpendicular to a first ground plane, and afirst weight positioned at or proximate to a first distance relative tothe first front end plane, at least a potion of the first weightpositioned along a first axis extending between the first front end andthe first back end; and a second club having a second club head, thesecond club head having a second toe end, a second heel end, a secondfront end, a second back end, a second top wall portion, a second bottomwall portion, a second face portion associated with a second loft angledefined by a second loft plane and a second front end plane, the secondfront end plane is perpendicular to the first ground plane, and a secondweight positioned at or proximate to a second distance relative to thesecond front end plane, at least a portion of the second weightpositioned along a second axis extending between the second front endand the second back end, wherein: the first loft angle is greater thanthe second loft angle; and the first distance is less than the seconddistance.
 15. The set of golf clubs of claim 14, wherein: the firstdistance comprises one of: a third distance being inversely proportionalto the first loft angle in a linear manner; or a fourth distance beinginversely proportional to the first loft angle in a non-linear manner;the second distance is inversely proportional to the second loft anglein the linear manner if the first distance is inversely proportional tothe first loft angle in the linear manner; and the second distance isinversely proportional to the second loft angle in the non-linear mannerif the first distance is inversely proportional to the first loft anglein the non-linear manner.
 16. The set of golf clubs of claim 14,wherein: a center of mass of the first weight is positioned at orproximate to the first distance; and a center of mass of the secondweight is positioned at or proximate to the second distance.
 17. The setof golf clubs of claim 14, wherein: an edge of the first weight ispositioned at or proximate to the first distance; and an edge of thesecond weight is positioned at or proximate to the second distance. 18.The set of golf clubs of claim 14, wherein the first distance is definedby a first equation of ((−0.086*θ)+3.797)≧x≧((−0.086*θ)+2.797), wherethe first distance, x, has units of inches and the first loft angle, θ,has units of degrees; and the second distance is defined by a secondequation of ((−0.086*α)+3.797)≧y≧((−0.086*α)+2.797), where the seconddistance, y, has units of inches and the second loft angle, α, has unitsof degrees.
 19. The set of golf clubs of claim 14, wherein: the firstdistance is defined by a first equation of x=(−0.086*θ)+3.297, where thefirst distance, x, has units of inches and the first loft angle, θ, hasunits of degrees; and the second distance is defined by a secondequation of y=(−0.086*α)+3.297, where the second distance, y, has unitsof inches and the second loft angle, α, has units of degrees.
 20. Theset of golf clubs of claim 14, wherein: the first distance, x, isdefined by a first equation of x=(−0.009*θ̂2)+(0.194*θ)+1.192, where thefirst distance, x, has units of inches and the first loft angle, θ, hasunits of degrees; and the second distance, y, is defined by a secondequation of y=(−0.009*α̂2)+(0.194*α)+1.192, where the second distance, y,has units of inches and the second loft angle, α, mass units of degrees.21. The set of golf clubs of claim 14, wherein: the first weightcomprises at least one of: a third weight integrated into the first bodyor a first adjustable weight; and the second weight comprises at leastone of: a fourth weight integrated into the second body or a secondadjustable weight.
 22. The set of golf clubs of claim 14, wherein: thefirst weight comprises: at least one or more third weights located at orproximate to the first bottom wall portion; and the second weightcomprises: at least one or more fourth weights located at or proximateto the second bottom wall portion.
 23. The set of golf clubs of claim14, wherein: the first weight comprises at least one of: a firstelliptical shape, a first circular shape, a first polygonal shape, or afirst free-formed shape; the second weight comprises at least one of: asecond elliptical shape, a second circular shape, a second polygonalshape, or a second free-formed shape.
 24. The set of golf clubs of claim14, further comprising: a third club having a third club head, the thirdclub head having a third toe end, a third heel end, a third front end, athird back end, a third top wall portion, a third bottom wall portion, athird face portion associated with a third loft angle defined by a thirdloft plane and a third front end plane, the third front end plane isperpendicular to the first ground plane, and a third weight positionedat or proximate to a third distance relative to the third front endplane, at least a portion of the third weight positioned along a thirdaxis extending between the third front end and the third back end,wherein: the first loft angle and the second loft angle are greater thanthe third loft angle; and the first distance and the second distance areless than the third distance.